Windows 7 - Problem loading Artwork in WMP12

Hi...
I'm running Windows 7 (64-bit) Home Premium.
I'm having a problem with album artwork showing in Library View and in the full window of Windows Media Player 12.
I have WMP Plus and WMPCD Text as plug-ins.

At Organize>Manage Libraries>Music, I've added a folder containing MP3 files.
I simply want to add the appropriate album cover to each track. I have these covers in another folder in My Documents.

With the previous version WMP 11, this proved easy. However, with WMP12...

Here's the problem:

In Library View, I click on eg 'Track 1' name>Tag Editor Plus>Pictures tab etc>Add>appropriate cover from folder as above>Apply

The artwork now shows in both Library View & when I play the 'Track 1'. So far, so good.

However, when I do the same with 'Track 2' and click 'Apply' the artwork from 'Track 1' shows beside 'Track 2', with BOTH tracks now showing the SAME artwork!

When I play 'Track 2' in 'Library View', 'Track 1's cover shows at the left and the correct cover shows top right!

When I play 'Track 2' in full window, Track 1's cover shows!

Clearly, Track 2's info is somehow not being carried over.

I've a lot of MP3 files I want to treat with their separate covers and I can't proceed till I get this sorted out.

I've even tried a rebuild of WMP 12 to see if that helped, but no...same result.

Can someone please tell me where I'm going wrong?

You're trying to set different artwork for two tracks of the same album? I'm afraid that such a scenario isn't really supported. I think that WMP only allows one cover for each album. As a workaround, you could try adding the artwork as a different type (e.g. Leaflet Page).